发出的信号不会在派生类中捕获(emitted signal is not caught in derived class)

发出的信号不会在派生类中捕获(emitted signal is not caught in derived class) class Settings : public QObject { Q_OBJECT public: Settings(); ~Settings(); void setValue(QString key, QVariant value); // [...] signals: void settingsChanged(); // [...] class ApplicationSettings : public Settings { public: explicit ApplicationSettings(); ~ApplicationSettings(); public slots: void save(); // [...]

每次我通过基类中的setvalue(...)更改值时，我都会emit settingsChanged() 。

在ApplicationSettings的构造函数中，我说：

connect(this, SIGNAL(settingsChanged()), this, SLOT(save()));

但是从不调用save() 。

class Settings : public QObject { Q_OBJECT public: Settings(); ~Settings(); void setValue(QString key, QVariant value); // [...] signals: void settingsChanged(); // [...] class ApplicationSettings : public Settings { public: explicit ApplicationSettings(); ~ApplicationSettings(); public slots: void save(); // [...]

Every time I change a value via setvalue(...)in the base class, I do emit settingsChanged().

In the constructor of ApplicationSettings I say:

connect(this, SIGNAL(settingsChanged()), this, SLOT(save()));

But save() is never called.

最满意答案

正如我一直在写这个问题，我注意到我的派生类中没有包含Q_OBJECT 。 添加此信号，信号连接正确。 我认为这个问题对其他人来说可能仍然有用，因为对我来说，基类的Q_OBJECT -macro不是“继承”也是新的。

As I've been writing this question I noticed that I did not include Q_OBJECT in my derived class. Adding this, the signal was connected correctly. I think this question may still be useful for others, because it was also new for me that the Q_OBJECT-macro of the base class is not "inherited".